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CVE-2018-8373 Microsoft CVE debrief

CVE-2018-8373 is a Microsoft Scripting Engine memory corruption vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. For defenders, the key takeaway is not just the flaw type, but that it has been flagged by CISA as actively exploited and should be prioritized for remediation through vendor updates.

Vendor
Microsoft
Product
Internet Explorer Scripting Engine
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-25
Original CVE updated
2022-03-25
Advisory published
2022-03-25
Advisory updated
2022-03-25

Who should care

Patch management teams, endpoint security teams, vulnerability managers, and administrators responsible for Microsoft Internet Explorer Scripting Engine or related Windows desktop environments should prioritize this CVE, especially where older browser or scripting components remain in use.

Technical summary

The vulnerability is identified as a memory corruption issue in Microsoft’s Scripting Engine / Internet Explorer Scripting Engine. In the supplied corpus, CISA records it as a known exploited vulnerability and instructs organizations to apply updates per vendor instructions. No further technical exploitation details or severity score were provided in the source set.

Defensive priority

High. CISA has added this CVE to the Known Exploited Vulnerabilities catalog, which is a strong indicator that remediation should be accelerated.

Recommended defensive actions

  • Apply Microsoft updates per vendor instructions as soon as possible.
  • Verify exposure across managed endpoints, especially systems that still rely on Internet Explorer scripting components.
  • Prioritize remediation in vulnerability management workflows because CISA has listed this CVE as known exploited.
  • Track completion against the CISA KEV remediation due date of 2022-04-15.
  • Validate patch status on endpoints and confirm the vulnerable component is no longer present or active where possible.

Evidence notes

This debrief is limited to the supplied corpus and official links. The source item is CISA KEV metadata for CVE-2018-8373, dated 2022-03-25, with remediation due 2022-04-15 and required action 'Apply updates per vendor instructions.' No CVSS score, exploit chain details, or additional vendor advisory text were supplied.

Official resources

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2022-03-25 and set a remediation due date of 2022-04-15. The supplied corpus does not include a separate vendor disclosure timeline.